PostgreSQL_CE
PGCES-02 · Question #14
PGCES-02 Question #14: Real Exam Question with Answer & Explanation
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Question
A table is defined as below. Select the most suitable description about the foreign key constraint. CREATE TABLE master (id INTEGER PRIMARY KEY, name TEXT); CREATE TABLE record (id INTEGER REFERENCES master (id), count INTEGER);
Options
- AIf any row exists in the "record" table, no change can be made to the "master" table.
- BIf the "record" table contains a row with an "id", no change can be made at all to the
- CIf the "record" table contains a row with an "id", the corresponding "id" row in the "master" table
- DThe "record" table cannot have duplicate "id"s.
- EThese SQL statements are invalid; no constraints are created.
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